I load only Nosler Partition 160 gr in my 7Mag. I'll need to double check but I'm pretty sure I'm pushing them with IMR 4350. Years back, Winchester used to make a Std/Mag LR primer, but haven't seen them on the shelves in years. They were great primers for the 7Mag, I still have several flats that I keep strickly for the big 7. Don't know what I'll switch to when they're gone.